A survey of 22,000 voters in the Conservatives’ 44 most marginal seats found that three-quarters of people are “dissatisfied” with the Government’s handling of Brexit negotiations.

Over half of those polled believe the policy is “bad” for Britain, while just 21 per cent believe it is “good”. The poll found that Brexit is considered more important in the marginal constituencies than the NHS and the economy.

“King Canute politics is not what Britain needs. And on the Chequers Agreement, the tide has already come in.”

Her view was echoed by Tony Blair, the former Labour Prime Minister who is also campaigning for a second referendum, who told Euronews that Chequers is “doomed to fail” because it will be voted down by MPs.

The survey found 45 per cent of voters believe Brexit and the EU is the most important issue, compared to 17 per cent who believe the NHS is the most important and 7 per cent the economy.

Overall 73 per cent of voters were dissatisfied with the Government’s handling of Brexit negotiations.

The poll found that 45 per cent of voters believe Chequers is bad for their family compared to 19 per cent who think it is good, while 47 per cent believes it is staying in the EU in all but name.

Nearly a third of voters said Chequers would make them less likely to support the incumbent MP, while 19 per cent say it would make them more likely to give their backing.

Eight in 10 of the marginal constituencies voted Leave during the referendum, according to estimates, while the seats include eight ministers.

Mr Rees-Mogg said: “Once again the good sense of the British electorate shines through. They recognise that Chequers is a pup, it is very dangerous for the Government because it fails to deliver on the result of the EU referendum. It makes the poll tax look respectable.”